SCN 4586 allowed the Velocity Scaling (Number of Implied Decimal Places) between the XL and the Drive to be configured in the drive. This required the XL to read the scaling format out of the drive and then calculate some scaling multipliers to scale back and forth between the XL and the Drive.

There was a bug that could cause the Fast and Jog velocity values sent to the drive to be incorrect if the scaling in the drive was changed after the initial power-up of the system.

This bug was discovered through code review when looking for an explanation for how the velocities could become zero. No means for them to be zero were found.